Mulligans
General Mulligans
These cards will allow you to keep your hand full in order to get an early mountain giant. Also, witch wood piper will help you to draw your combo or to get a doomsayer out if you need it.
This deck focuses on winning by creating 5 or 6 Sherazin, Corpse Flowers and then continuously using them to clear your opponents board while using cards such as Pick Pocket and Razorpetal Volley to resurrect your own.
The Combo
This is a three step combo. Most of the combo pieces can be drawn through your Witchwood Piper, which can be shadowstepped.
Step 1: Draw Sherazin, Corpse Flower and Carnivorous Cube
Step 2: Play Necrium Blade and reduce it to 1 durability.
Step 3: Play Sherazin, Cube Sherazin, and then break the Necrium Blade. Once your cube has died, you will be left with 5 Sherazins.
Surviving Early Game
Because so many cards in your deck add extra cards to your hand in order to insure the continuous survival of your Sherazins, you can use Mountain Giant to provide some early game aggression if you think you are up against a control deck. Also, doomsayer can allow you to force aggro decks to waste removal or to skip a turn.